exercise-normal dist with Key

# exercise-normal dist with Key - ECO 6416 - Dr. Dickie -...

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ECO 6416 - Dr. Dickie - Exercise - Normal Distribution Normal Distribution Tables required for this exercise Problem 1. Scores on a recent national statistics exam were normally distributed with a mean of 80 and a standard deviation of 6. a. What is the probability that a randomly selected exam will have a score of at least 71? b. What percentage of exams will have scores between 89 and 92? c. If the top 2.5% of test scores receive merit awards, what is the lowest score eligible for an award? 2. The life expectancy of Timely brand watches is normally distributed with a mean of four years and a standard deviation of eight months. a. What is the probability that a randomly selected watch will be in working condition for more than five years? b. The company has a three-year warranty period on their watches. What percentage of their watches will be in operating condition after the warranty period? c.

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## This note was uploaded on 11/15/2010 for the course ECO 6416 taught by Professor Staff during the Spring '08 term at University of Central Florida.

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exercise-normal dist with Key - ECO 6416 - Dr. Dickie -...

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